TERTIARY INSECTS FROM KUDIA RIVER, MARITIME 

 PROVINCE. SIBERIA 



By T. D. A. COCKERELL 



Of the University of Colorado, Boulder 



In a previous contribution ^ I have described two species of in- 

 sects from the Tertiary rocks of the Kudia River, a tributary of the 

 Amagu, in the Maritime Province of Siberia, North Latitude 46°. 

 During July 1923, my wife and I, assisted by A. I. Lavrushin (or 

 Lavrooshin), investigated this deposit, and collected the insects 

 described below. We also obtained a good collection of plants, 

 which will be described later by Dr. A. Kryshtofovich. 



The exposure is very limited, and since it was visited by Mr. Kuz- 

 netzov the clay bank above it has fallen, covering the fossiliferous 

 rocks with talus, which rests at such an angle that a little move- 

 ment brings more down. It was therefore difficult to obtain much 

 material, and the rock itself was comparatively unproductive, a 

 day's labor in splitting it and turning it over sometimes giving 

 little but fragments of /Sequoia, Alnus, etc. Some of the best in- 

 sects were found in the bed of the clear and cool Kudia River. 

 Mr. Lavrushin Avent up and down the river, and also a consider- 

 able distance along the Amagu, in the hope of finding another ex- 

 posure, but without success. He did, however, find a fragmentary 

 fossil leaf on a hill overlooking the Kudia, but it was not in place. 

 Doctor Kryshtofovich, from the collections of Kuznetzov, has iden- 

 tified a flora of 19 species from this deposit. These species are on 

 the whole such as have been considered characteristic of the Eocene, 

 though at least four are said to range upward to the Miocene, while 

 five are not definitely referred to any species. The only new species 

 (Porana sichota-alinensis) is related to a Miocene fossil. It must 

 also be said, that the aspect of the flora is comparatively modern; 

 in fact there is very little which can not be said to be closely allied 

 to plants still living. We no longer find Sequoia or Ginkgo in the 



»Proc. U. S. Nat. Mus., vol. G4, art. 13, no. 250."?, 1924, pp. 1-15, pis. 1-2. 



No, 2606.-PROCEEDINGS U. S. NATIONAL MUSEUM. VOL. 68. ART. 5. 

 53652—25 1 j 



